Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
пет
←
Proto-Indo-European
*pénkʷe
(inherited)
←
Proto-Slavic
*pętь
(inherited)
→
Latvian
pieci
(cognate)